Using the custom build, I've waited about 10 minutes after getting new headers and tried to post new message. I got dialog saying "Unable to post message". Clicking "Retry" makes posting message fail and go back to the "Unable to post message" again and again; if I cancel and write the message from scratch, it is sucessfully posted.
EDIT: Happens always if I wait too long between getting new headers and trying to post. Latest log:
[DEBUG] 15:34:50.003 | [Usenapp 1058405]Files database not found. Creating a new one.
[INFO] 15:34:50.071 | [Usenapp 615769]----------------------------------------------------------------
[INFO] 15:34:50.072 | [Usenapp 615882]Start NNTP_Post Operation for =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=
[INFO] 15:34:50.073 | [Usenapp 615969]----------------------------------------------------------------
[DEBUG] 15:34:50.079 | [Usenapp 522670]1) 9442634733979 | chmurka | 0 | sendToServer
[DEBUG] 15:34:52.693 | [Usenapp 515218]9442634733979 | chmurka | No segments available. Socket is going into IDLE mode.
[ERROR] 15:34:52.695 | [Usenapp 631816]Posting failed for Object: =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=
[INFO] 15:34:55.134 | [Usenapp 615769]----------------------------------------------------------------
[INFO] 15:34:55.136 | [Usenapp 615882]Start NNTP_Post Operation for =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=
[INFO] 15:34:55.137 | [Usenapp 615969]----------------------------------------------------------------
[DEBUG] 15:34:55.142 | [Usenapp 522670]1) 9442634733979 | chmurka | 0 | sendToServer
[DEBUG] 15:34:57.695 | [Usenapp 515218]9442634733979 | chmurka | No segments available. Socket is going into IDLE mode.
[ERROR] 15:34:57.697 | [Usenapp 631816]Posting failed for Object: =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=
[INFO] 15:34:58.964 | [Usenapp 615769]----------------------------------------------------------------
[INFO] 15:34:58.966 | [Usenapp 615882]Start NNTP_Post Operation for =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=
[INFO] 15:34:58.966 | [Usenapp 615969]----------------------------------------------------------------
[DEBUG] 15:34:58.969 | [Usenapp 522670]1) 9442634733979 | chmurka | 0 | sendToServer
[ERROR] 15:35:01.695 | [Usenapp 631816]Posting failed for Object: =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=
[DEBUG] 15:35:01.695 | [Usenapp 515218]9442634733979 | chmurka | No segments available. Socket is going into IDLE mode.
[INFO] 15:35:03.480 | [Usenapp 615769]----------------------------------------------------------------
[INFO] 15:35:03.481 | [Usenapp 615882]Start NNTP_Post Operation for =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=
[INFO] 15:35:03.482 | [Usenapp 615969]----------------------------------------------------------------
[DEBUG] 15:35:03.487 | [Usenapp 522670]1) 9442634733979 | chmurka | 0 | sendToServer
[DEBUG] 15:35:05.698 | [Usenapp 515218]9442634733979 | chmurka | No segments available. Socket is going into IDLE mode.
[ERROR] 15:35:05.700 | [Usenapp 631816]Posting failed for Object: =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=
[INFO] 15:35:07.100 | [Usenapp 615769]----------------------------------------------------------------
[INFO] 15:35:07.101 | [Usenapp 615882]Start NNTP_Post Operation for =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=
[INFO] 15:35:07.102 | [Usenapp 615969]----------------------------------------------------------------
[DEBUG] 15:35:07.107 | [Usenapp 522670]1) 9442634733979 | chmurka | 0 | sendToServer
[DEBUG] 15:35:09.696 | [Usenapp 515218]9442634733979 | chmurka | No segments available. Socket is going into IDLE mode.
[ERROR] 15:35:09.697 | [Usenapp 631816]Posting failed for Object: =?UTF-8?B?UmU6IGFhYWHEheKIgsSFxZvEhcWbIGTEhcWbw7NewqDiiILEhcWbw7NexZvEhWQgxIXFm17Ds+KIgiBzYWTDs8WbxIVeZG1zYW/iiILCoMWbwqjEhXNhIGRvxIXFm+KIgiDEhcWbXsOzZMKgxIVexZvDs2TCoMWbxIXDs15kIMSFxZvDs15kwqDEhcWbw7PiiILCoMSFxZtew7NkwqBexIXDs8Wb4oiCwqBexIXDs8WbZMKgw7PEhV7Fm2TCoMWbw7PEhV5kIMSFxZvDs17iiII=?=