Edit: I know what the issue was. The format for Tags has just been changed from requiring " ; " to either a space "   " or a comma " , " between tags and only a maximum of 5 tags is allowed. Therefore when trying to modify the Description, mu "Spice Miscellaneous" and "Spice Opto" tags are now seen as two tags and not one which took my effective number of tags from 4 to 6. As soon as I reduced the tags back to a total of 5 then the modify request was granted. **Please note that changing the tag delimiter like this probably trashes almost all of the Spice symbol tags because they will now go over the 5 tag limit.** Trying to modify the description of a spice symbol for a PS2501A_1 that I have just created by cloning PS2505 I get: