I recently had a problem with opening the dymaic properties page in admin-mode. I was getting the ever helpful "object not set" error. I traced the problem to a property where the type didnt exist in the database. An simple mistake on our part (we are migrating from epi4).

After correcting the rogue property I can now go into the dynamic properties in admin mode.

However, when I now go into the dynamic properties in edit mode, I face a new issue. The error is "Collection was modified; enumeration operation may not execute."

Before I delve into solving this I would like to know if anyone has faced this error before?