Sorry, I meant to decrease the value for the tolerance.
Do you have the same problem if you change the value to 1 or 2 instead of 5?
If yes, try the following for debugging purposes:
1) Use built-in symbols from MapGuide instead of your own symbols for the
point layer.
2) Use different scales and
Have you tried to increase the tolerance for the tool tip?If not this link
may help you:
http://adndevblog.typepad.com/infrastructure/2012/05/how-to-change-the-tolerance-of-tooltip-in-ajax-viewer-and-fusion-viewer-of-aims-or-mapguide.html
