I have this problem in ver.7.0.9 and it is described/solved here:
http://www.boonex.com/forums/topic/Page-builder-not-working.htm
Well, same thing happend after I upgraded to Dolphin 7.1
I had to 'repair' that file (....../administration/templates/base/pbuilder_content.html) again and Pages Builder started to work.
Is it maybe that this is happening because in my:
Settings -> Templates and then while in the List of Templates -> Settings in right top corner , on that Settings page
the fields for:
- Minimal/Maximal allowed page width (pixels): are both empty. Is that OK or there should be a value? If so what are the default values?
But then again, I checked original mentioned file (and it is attached as weel) and there are those mistakes in a file!
Regards, Mayki