P6 locks up or is very slow when loading schedule

Hello fellow planners,

I have a BIG issue. I have been running P6.2 standalone for two years with SQL. Yesterday, I could not open P6 at all. I reloaded SQL, I reloaded P6, and I verified my database configuration. Now, I can open P6 but my small schedules take very long (5 minutes) and my large schedules 4000+ tasks don’t load at all. P6 just sits there acting like its loading but does nothing. I received an error message yesterday about "shared memory". has anyone encountered this problem before? Any solutions?

Thanks!