Hello YAG, Again I appreciate your assistance in helping me find a resolution to my problem. Just to re-iterate. The checkbox problem is the one that I can reproduce, but the application as a whole is slowing down as well. One of the users will minimize the app and work on other things like inbox, a software called cerner, and excel, when she returns to the call center app it barely runs. It will take several seconds just to tab from one control to the next.

Here are the answers to your questions.

1. Is there a screensaver running?
Yes, I checked each machine that is running the app and everyone uses a screen saver. I know mine does (set at 10 minutes), but I can repro the problem before the screen saver appears. I will turn it off when I get time today to see if this has any affect.

2. Is the program running from a local drive or network drive?
The program runs from a local drive.

3. Is your application multi-threaded?
Both programs that I have tested have two invisible forms that run in the back ground. Based on a timer (both set at 15 seconds), they execute a sql query. Basically the call center gets a courier pickup call. The pickup is logged and a message is sent to the dispatcher's pager. The dispatching application will query the database for the new pickup and if it finds it, the form will appear on the screen for the dispatcher to select a courier (message is sent to courier's pager). The other form is to notify the dispatcher that the courier has or has not acknowledged the new pickup. Anyway, CallCenter (one form to verify whether dispatcher has received notification of pickup, other form to verify courier's acknowledgment of the pickup), Dispatching app (one form to notify dispatcher of pickup, other form to log notification of pickup by courier). This could be the problem, but currently the dispatching application is not being used so the call center users just minimize these forms when they pop up the first time. If the forms are minimized then they do NOT query the database again. This is probably too much info, but maybe it will help.

4. Are there any other forms open that might be locking the app?
The two forms running in the background.

5. Is it possible that another event has been fired - What events are the form/controls trapping?
I do have some controls on the form that capture the leave event and one that captures the validating event; however, one of the checkboxes is not even near one of those controls.

Thanks again for the help and I hope you have a great day!