when i try to use »Transformations« from the Filter menu I get the following:
Error with Filter: transformations
-[__NSCF String componentName]: unrecognized selector sent to instance 0x6000029b70a0
when pressing OK the last transformation command is executed instead of showing the transformations panel.
I found out this only happens with glyphs containing corner components, with all the other glyphs the filter still works fine.
It appeared all of a sudden, used the filter without any problems a couple of times just a few minutes before the error occurred. I did not make any changes to the corner component,
and also did not make any updates, neither glyphsapp nor plugins. Restarting GlyphsApp did not help, and it’s also happening with older versions of my font file.
I’m running the latest version 2.6.2  on OSX Mojave 10.14
Any help on this would be appreciated.