Excel misteriously crashes when populatins a comboboxes

[Fuodi]

hi everybody!

When I initialize a form in my excel I run this code to populate some comboboxes:

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HERE THE EXCEL CRASHES ABRUPTLY! IF I ERASE THE .CLEAR STATMENT, IT CRASHES WHEN TRYING TO LOAD THE FIRST ITEM. I HAVE INVESTED QUITE A LOT OF TIME TO UNDERSTAND WHAT IS HAPPENING BUT IS IT IS A MISTERY. IF I UNLOCK MY VBA CODE WITH MY PASSWORD, THEN IT NEVER CRASHES... IF I CLOSE THE WORKBOOK AFTER UNLOCKING THE VBA CODE AND THEN OPEN AGAIN THE EXCEL FILE AND RUN THE FORM, IT DOES NOT CRASH. IT ONLY CRASHES WHEN I OPEN A NEW INSTANCE OF EXCEL, OPEN THE FILE, AND OPEN THE FORM.

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DOES ANYONE KONW ABOUT ANY BUG THAT MAY BE CAUSING THIS AND HOW I CAN SOLVE THIS MISTERY?!

THANKS IN ADVANCE FOR YOUR HELP!

FRED

[Medpack]

This post needs more caps lock.

[Fuodi]

Sorry MEdpack, I'm a newbie on this forum. Did I do anything wrong in my post. i would be glad to repost If anything is not clear or well posted.

[Cutter]

@ Fuodi

Welcome to the forum.

Did I do anything wrong in my post

Please notice that code tags have been added to your post(s). The forum rules require them so please keep that in mind and add them yourself whenever showing code in any of your future posts. To see instructions for applying them, click on the Forum Rules button at top of the page and read Rule #3.
Thanks.

But, apart from that, Medpack was referring to your use of all upper case letters which, in the digital world, is considered shouting and, therefore, rude by some.

[Medpack]

To build from Cutter, just comes off a bit hostile and also iradic. Nonetheless you seem friendly enough and it isn't a big deal. I'm just not much of a fan of digging through walls of text and that was my sarcastic way of hinting at cleaning your post up.

[Fuodi]

Thanks Cutter & MEdpack for helping the Newbie!
My second try, now with the code tags and hopefully a bit more clearer:
I have an excel system and I'm working a new form. When it initializes I do simple things like loading a combox:

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or putting some frame visible or invisible:

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What is worrysome is that the excel crashes when it gets to these instances, but before I have populated other comboboxes or change the visible propert of other frames, succesfully. So it only crashes when I try to modify or alter certain controls.
The story gets more creepy when I realize that if I run the form after unlocking the VBA code (it is password protected) I can use the system all day long and it never crashes. and, if I close the excel file and open it again without closing the excel application, it also does not crash, 100% stable.
I have read in some forums about some people having similar problems, but I haven't find answers. Maybe the excel file is corrupt. I tried earsing those control and building new controls, but does not work.
Any ideas/suggestions?

Thanks again for you help and for the patience with the newbie!