Well, that is interesting.
I can't apply a Fixed constraint to that face either?
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.....on related note - post in the idea station a suggestion for option to apply pressure to tangent faces - that is insane! I guess never did anything more complex than a simple pressure vessel.
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If I saved out as a STEP and read back in - the STEP seemed to work. Not an ideal solution....
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thanks, ill just run with the 1mm thicken on that face, I have to put a few more features around that circle anyway so maybe it will come back... and yes as soon as I get chance I will put the presure load on tangent faces on the iseas station, this is my 14th attempt at this model and each saveas and change normally requires about 25% of the faces to be reselected