Quoting Christophe Rhodes (csr21@cam.ac.uk):
With a version of mcclim updated on march 31st Autowrite works fine. With the latest version I get the error below. Could somebody help me please?
| The class #<SB-KERNEL:STANDARD-CLASSOID CLIM-INTERNALS::BASIC-OUTPUT-RECORD> | is currently invalid. | [Condition of type SIMPLE-ERROR]
As I said in my reply to Fred Gilham, this is likely a bug in CMUCL 19c; it can probably be worked around, but to do so it would be nice to know what the bug is in the first place so that the CMUCL people can fix it; to achieve this, you can bisect the CVS to find the commit that changed things, then work out which portion of that commit exposes the problem.
That looks unlikely to be a CMUCL bug to me. :-)
It rather seems to be Christophe's removal of compatibility with older SBCL bugs, solved by either upgrading SBCL or reverting Christophe's recent McCLIM patches.
d.