You can now download an update for ZHLT Compile GUI X². I've taken a look at all bug reports and tried to fix the code according to the bugs reported. The changes in this update are:

-The run-time error 76 after compile should be history after installing the update
-As some of you requested: an option in the config dialog to save the wad-directory (use it at your own risk, I left saving it out intentionally)
-The "Fix problems" link in the start menu now shows a message when it's done fixing the problems
-The textbox which holds the HL start parameters in the config dialog now appears when it should

There was one bug reported that there was an error message when a map with a leak was compiled. So I created a map with a leak and test-compiled it. However, there was no error message. If anyone of you should see a run-time error 424 after compiling a map with a leak after installing the update please drop me a line.
IMPORTANT: As I wrote in the readme you can't close the program by clicking the X in the title bar after a compile is finished. This is because of the skin handling and cannot be solved, sorry. You can still close the GUI by using File->Close. Alternatively you can switch to another window of the application and click the X in the title bar there.
Now head over to the download page and get the update. Just start the .exe included in the zip file and follow the instructions on screen. Manuel's mirror will be updated as soon as possible.