Milt,
PMFJI, but I beleive it has to do with the filter you are applying. Take a look at FILTER() just before the SEEK (throw a suspend in there). Filter conditions are tricky. More often than not, the exact phrase you type in is used as the filter condition. It is evaluated at the time of setting the filter and each time the table is accessed afterward. If THIS.Psavetable doesn't exist all the time (and in the case of running code within the button, it doesn't), VFP throws the error you are seeing.

Ex.
lcfilter = [']+EVALUATE(This.psavetable+".c_region")+[']
set filter to mailcode.c_region_id = &lcfilter

Use the ['], if your values are character based.

HTH.

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