Regarding opening Hero Lab files causing a crash - I have 100% failure on this even after uninstalling and re-installing v1.5.4. It worked in 1.5.3. It may be an installation issue, or the unZIP DLL is missing from v1.5.4. Here is the error from the error log:
System.IO.FileNotFoundException: Could not load file or assembly 'IonicZipDll, Version=2.5.1.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
Since Hero Lab .POR files are in fact .ZIP files, Combat Manager is probably calling an unzip routine to access them. The error implies that v1.5.4 cannot find the .DLL that contains the unzip routines. I went back to v1.5.3 and HL import is working again.
I just found Combat Manager last night. Excellent work! In a world of less than ideal RPG software, Combat Manager is a true standout. Thanks!