"Rename Layer" pops up whenever tapping only once with stylus

Working with Mac High Sierra, Wacom Cintiq DTZ-2100. This may be a Wacom issue, because Wacom is the absolute worst, but I am working on an old (relatively speaking) Wacom Cintiq (DTZ-2100) They have stopped updating drivers for anything over El Capitan for Mac. I am working with SBPRO 5.1. Every time I tap once to select a different layer, a pop-up window shows up to rename a layer - as though I am double-tapping with the stylus. Anyone else experiencing this? I have tried to adjust pen pressure sensitivity to no avail.