I've had some problems under the IDE that were fixed with unsettings and disabling Global menu and the Overlay Scrollbars.
I've reported the problem in Lazarus' Mantis: #0021465, #0021467.
There is also this bug report talking a bit more about it: #0019266
Their solution was to use unsettings to turn off Global Menu and Overlay Scrollbars.
I've had a quick search about the problem and there's an open bug report at Launchpad: overlay scrolling is broken in lazarus.
So, is the problem related to "lib overlay scrollbar"?
If it is, is there a solution via code, to avoid turning off both the Global Menu and Overlay Scrollbars?
If NOT, is there anyone taking notice and fixing the issue?
Many thanks, Gus
According to Zeljan Rikalo (cf. mantis 0020520) this issue is not fixable from lazarus itself. Instead you can export LIBOVERLAY_SCROLLBAR=0 or use libc.putenv() (man putenv) and add LIBOVERLAY_SCROLLBAR=0 to your application.