I have also applied the line of code to the source view of a test product item's long description. The PowerStore gallery will not appear.
Below the line of code in the 'Add to Powerstore' section of the gallery/Admin/addtosite.php, there is a note:
The only two known issues documents are:
PowerStore 3: Support Fix - Create View Restriction Preventing Install (29 Kb)
PowerStore 3: Support Fix - Browser error when installing or changing store name (8 Kb)
Please would someone specify what the fix is.