Is 7.6.1.23 the latest ?
If it is then the resolution issue still isnt fixed. I updated to this build this morning and nothing has changed regarding the resolution issues. If its not the latest then that will be the reason why, but 7.6.1.23 is all I was offered in the software updates.
EDIT: All settings values had returned to default, so I changed to Asynchronous and now the resolution seems to be being displayed a bit better. However its still not completely fixed. One thing to note and its crazy really, but after a restart the resolution displays nearly 100% of the time when you zap, but after about 5 mins it goes back to not displaying properly again.
More testing required later today after work to be sure though, but in short if 7.6.1.23 is the latest then its still not fixed.