Code morphing stops VBA

Hello everybody. I'm new here, sorry for rushing out so fast to post this, but it's an emergency. Also, this might as well be the most technical Excel VBA question ever.
In my project I have a form that lets the user write their own VBA code and run it via Module Insertion. It used to work fine (you open the form, type some VBA code, press run, and voilá) until today.
I had to make a small change in the project, I just edited a little piece on ABSOLUTELY-UNRELATED code on another form, and suddenly, when I was testing it with my VBA scripter form, when I hit Run, the whole execution of VBA stopped. Everything but Excel closed, and now, I can't keep it from automatically shutting down the execution when the event of the button finishes. This has become really anoying, since I was already creating my own separate debugging files to load on it.
Here is the source code for the VBA Scripter window if you need it.

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Note: The code on the script window does execute, but everything stops right away when the BtnRun_Click event finishes.

Ok, I removed the 'On error goto...' stuff, and it still closes everything.
about the Immediate window, yeah, that would be nice, if I didn't have to use for-next cycles to get some results.
(about doing it like:
For A=0 to 10:Msgbox A: Next
)
No, some of the For cycles aren't that simple.

The other instance of Excel might be the only option I guess, even if I can't properly debug from there...
And, yeap... I also removed that from the code being generated.
BTW, I started notticing something about the forms... at first, the focus was on the input textbox (when it was working nice) and now, it doesn't have it... hmmm... weird...
Thanks.... :/

!!!!! You won't believe it! I (kind of) Fixed it!
It was due to the forms being shown as modeless, whereas modal will make them stay onscreen and not unload.
(yes, I remember doing that little change before testing the form today)
Strange.