Endless loop with two activex listbox'

Hi all,

I've got a sheet with two listbox'. Depending on what was chosen in the first one, the second one changes its value:

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Both of them execute another code:

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The code itself is working perfectly. If I change the "Combobox2_Change" event to "Combobox2_LostFocus" and leave everything else unchanged, everything works. But when it's set to "Change" there is always an error.

Anyone can make out something of this? I'll try to desensibilize the workbook in a few mins.

Test.xlsm

file attached

anyone got an idea?