Thanks for your response.
The gray tick thing happens to me lots though, usually after not touching the phone for about an hour.
Then on, until I restart Yappari, any message I send out to anyone or any group just gets a gray tick mark. No errors in logs. I test my GPRS connection using pidgin & skype and those work. Main Yappari screen says I'm still logged in; a check on netstat and QNetMan shows that the Yappari session is still connected too.

First 2 screenshots are before a Yappari restart.
Note the date/time at status bar and in messages.
3rd screenshot was taken after a Yappari restart.

All the while, before or after restarts, incoming messages continue to come in as & when available.

Screenshot 4 shows another behavior i noticed.
If you note the date/time at status bar and in messages, you might notice that my friend's status was "typing" for over 25 minutes.
Fact is, he stopped typing immediately after sending the last response.

Just fyi & hope the info helps you.
Lemme know if you would like the logs despite them not showing much errors. Would be great if a next release has more diagnostic info on message sending.

Oh on the log files, I can make a suggestion to prevent log file overgrowing. Write to log files appended with a number representing day of week. You'll have 7 log files, one for each day. When writing to current day log file, always ensure the next day's log file is deleted. When the next day comes, a new empty log gets created for that day. The only issue with this is when crossing timezones (I happen to cross timezones quite regularly); log entries get mixed up when time is changed. There's an alternative to this though.

Keep up the good work!

Best regards,

kh