Sorry, I have not had time to follow the forums recently, but did some catching up.
I think that the problem is with the file macros/contextPercent.pl in the main pg packages which still had a character which could not be read properly after the change to using UTF-8 encoding. It and several other files were updated in the develop branch by Glenn Rice to avoid using the ISO-8859-8 encoded copyright character which is apparently triggering the error message you got, but that fix is not in the current "master" (PG 2.15) branch.
The quick fix would be to manually edit the file on your server. Merging in the specific commit from Git would fix it also in several other files.
I think that the problem is with the file macros/contextPercent.pl in the main pg packages which still had a character which could not be read properly after the change to using UTF-8 encoding. It and several other files were updated in the develop branch by Glenn Rice to avoid using the ISO-8859-8 encoded copyright character which is apparently triggering the error message you got, but that fix is not in the current "master" (PG 2.15) branch.
The quick fix would be to manually edit the file on your server. Merging in the specific commit from Git would fix it also in several other files.