I just installed TextPad 5 today; At first I was able to compile my java files but now the options under Tools-> External Tools are grayed out (transparent). I don't how I compile my files or get my options back.
This happened even after I installed the license.
I have had some luck deleting tools, then re-installing them under configure/preferences. This has worked on several issues when nothing else will. (That's all I know about it)