? check failed: typedmess: set: corrupt object

I just can't seem to shake this error:

? check failed: typedmess: set: corrupt object

I don't just get one - I get a huge stream of them - pages and pages of them.

Its intermittent and only happens about once every 5-20 loads. It seems to happen a little less when opening the patch in Max/MSP than when opening the same patch as a standalone application.

Its causing a weird error where my loop location in the waveforem~ object is no longer displaying correctly. Using a line connected to a table that then sets the loop points in the waveform object.

My patch is 7 years old and a bunch of crazy code so its not practical to isolate as when I do simplify things the problem goes away.

Any clues as to what exactly this error means so that I can track is down would be great. I've been using a liberal dosing of deferlows to try and make the patch open nicely and not attempt to do too much at load time.

Many thanks,

Stefan