I need to change the number of errors to more than the default of 500, I have tried to find how, and if, I can do that but couldn't find anything. Any help would be appreciated. Thanks.
I haven't found out any option in ProjectX to enlarge to number of errors that can be shown in the ProjectX project logs. So if your intention is to read from the log also those errors that come after 500 first, I believe you must contact the programmers to add this option to the program.
to disable the error limit you can uncheck "log max. 500 warnings/errors" in "ProcessWindow", menu "Messages". The process window is opened with "prepare >>" button in main screen.