Some of these problems (roughly 100 out of 2000) use a macro called pccTables.pl, which lives in webwork-open-problem-library/OpenProblemLibrary/macros/PCC, and which actually just redirects to something called niceTables.pl, which currently lives in the develop branch of pg/macros. niceTables.pl assumes certain alterations have been made to the latex preamble for hard copies; changes that are part of the develop branch of webwork2.
Complicating things, at an earlier stage, a more primitive version of niceTables.pl was called pccTables.pl, and that pccTables.pl currently lives in the master branch of pg/macros. The problems may still function using this older pccTables.pl, but some may need the new pccTables.pl which is redirecting to niceTables.pl.
All this should be sorted out with a late winter 2.10 release. But in the mean time, trying to use the 100 or so problems that rely on niceTables.pl may cause you some headache.
PCC Basic Algebra and Basic Math problems
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