Macro stopped woring - worked 100's of times before (Hide/unhide)

[InvalidTxtString]

I've always used this to hide/unhide months (Have 12 months, just included juli to show)
It have worked 100's of times - suddenly it doesn't - when I try to use the checkboxes(for the true/false in F31) it shows me a debugger saying - in my poor translation

Run-time error '1004':
Can't define option hidden for the class Range

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[xlnitwit]

Hi,

Is the sheet protected that you are trying to change?

[InvalidTxtString]

They always were with an autoprotect in the workbook_open - so that was my first thought too - but it doesnt matter if I unprotect everything - same protected/not

[xlnitwit]

Is the error occurring on all sheets or is it only one specific one?

[InvalidTxtString]

All sheets, all checkboxes (Theres 12, one for each month)

And it's ALWAYS worked up untill now.

12 months of data in each sheet - but the checkboxes determine which are hidden/shown, So if I check Juli, all columns not involved with Juli is hidden ans so on.

[xlnitwit]

Can you attach a copy of your workbook please?