The error pops up at the bottom of the library browser when I browse problems Library/UMN/algebraKaufmannSchwitters problems (problem numbers 166-170 in the library browser). I think these are the problems causing the warning:
UMN/algebraKaufmannSchwitters/ks_6_1_44.pg
UMN/algebraKaufmannSchwitters/ks_6_1_68.pg
UMN/algebraKaufmannSchwitters/ks_6_1_80.pg
UMN/algebraKaufmannSchwitters/ks_6_1_96.pg
Lars