I upgraded everything using the git master branch and also performed ./OPL-update. Both WeBWork and PG are version 2.11
However, I have this strange problem where in the library browser The reported "matching problem" is always more than the actual problem sets I see.
For example, if I choose
Subject: Calculus - single variable
Subject: Definition of the derivative,
it reports "There are 122 matching WeBWorK problems" but only 43 can be accessed.
This happens in many of the subject-chapter-section choices.
You can access all of them.
Some of the problems should have a black outline and an "M" among the icons which stands for "more like this". If you click on the M it shows similar problems, which are part of the count of 122. In the development (and future) version of webwork, there is an explanation about this at the bottom of the page.
When you click on the M, the group expands and the M turns into an L for "less like this". Clicking on the L hides the extra problems.