One single Win 7.1 client installation of Pergamon resulted in failure of the reports system when an attempt was made to start any report. This had a general implication as scripts are used in a number of locations, including the running of bulk database updates.
Long term investigation failed to turn up a cause, and upgrade to Windows 10 did not cure the problem. It is thought that a clash of software on the terminal, caused by bad printer drivers or installed security software were the cause. As no other site ever reported the problem, it was too specific to examine further.