App window does not refresh

I installed SmartFTP about a week ago, and it worked great. I was about to purchase a license, but now when I start the app, switch to another app window and back, the SmartFTP app does not refresh. I get an hour glass when I hover over the window. I can switch to other applications and use them, but SmartFTP never comes back.

It doesn't matter which app I change to. In fact, I've just minimized and restored SmartFTP, and had the same problem.

+- System -----------------------------
Microsoft Windows XP Professional
Service Pack 2 (Build 2600)

CPU Speed : 1995 MHz
Total Memory : 1527 MB
Free Memory : 708 MB

+- SmartFTP ---------------------------
Version : 2.5.1008.21
Time Stamp : 2007-12-05 00:19:47
Platform : x86

+- Application DLL --------------------
sfFTPLib.dll : 1.5.11.16
sfFavorites.dll : 1.0.4.21
sfFavoritesShellExtension.dll : 1.0.1.4
sfTransferQueue.dll : 1.0.1.21
SmartHook.dll : 1.0.2.2

+- Language ---------------------------
SmartFTP.exe : 2.5.1008.21

+- Internet Explorer ------------------
Version : 6.0.2900.2180

+- Winsock ----------------------------
Winsock : 2.2

Ahem...never mind...needed to reboot my PC...it's working great again. Should have posted this on the Windows forum.