When this change went live, it was not meant to enable the permission for existing guild stash tabs (and the original implementation didn't do this). Unfortunately a subsequent related change broke this behaviour, and we managed to miss this related break in subsequent QA. We have now forced all the Initiate remove-items permissions off for all guild stashes. If you're a guild leader, you will need to turn the permission back on for specific guild tabs that you want to enable it on. We are very sorry about the inconvenience caused.