[Therion] Therion Window gets smaler every time you compile

Hi I'm using Therion 5.4.1+3bee73c on Windows 7. But also tested with 5.4.1+975063a and same.behaviour Every time when I click on "Compile" (or use F9 instead) the window from Therion get's a bit smaller in size (up down direction). Is there a fix for that? regards, Torsten