Only window frame displayed


I tried running Joplin 1.1.4 and 1.2.6 on Win 7. AfterWhen launching the application, only window frame is displayed, with the clasic win buttons in top right corner (min, max, close). Looks simmilar than this:

I checked the log file and things seem normal (no errors reported). Any suggestions? It seems to me that this is a graphics problem.

Thank you!