With the rollout of 1.22wmf13 to the Wikisource sites last night, I am now seeing sporadic rendering of mw-customeditbutton onto the traditional toolbar. Sometimes I have to refresh a loaded page three or four times to get the additional buttons to render onto the toolbar. I have seen this at other times with Pathoschild's regex scripts not loading, but this is first time that the ResourceLoader issue (presumably) has been so recalcitrant with toolbar.

Any suggestions on a resolution would be appreciated.

Regards, Billinghurst