I got the following error message in a track I'm working on (created in 2.5.0 using the built in plugins + samples + some external samples):
"Indice de liste hors limites (-2)"
this message is displayed twice, after which the VST(i)'s look like this:
I don't know what I did prior to this message appearing, it just suddenly was there when I was going to edit some VST parameters.
In words, the VSTi interface always has the same dimensions, regardless of plugin loaded. The same error is also always displayed twice, regardless of plugin loaded. In the case of Drummatic for instance the bottom half of the plugin is obscured, and I haven't found a way to remove this "feature". This error repeats itself even if I close Madtracker and restart. It also appears if I start a completely new song in Madtracker.
However, a re-install of Madtracker solved the issue. So this post is more of a FYI