Sanity check failure

[Robert Haussmann]

30+ years of using FP and never saw this message before.  Any suggestions?  No changes to code recently?

Sanity check failure!

Mvbytes <0
File-bixins.c, line=398

Tptr=tptr(1,0,13620,1,0)
File='progrx@'  index=H


Thanks,
Bob
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