Dialog box display won't update after screen blank or being moved

Question

I have a modeless dialog box used for status display by a plugin I wrote for Acrobat. Everything works fine until the screen blanks or the user moves the dialog box on the screen, at which point no further updates to the dialog box are displayed. My plugin consumes 100% of CPU for long periods of time so the program can appear dead without this display being updated, but nothing I have tried seems to make any difference. The dialog box is generated with ADM and things I have tried include calling "Update" on the dialog box at regular intervals, the windows "Sleep" function to yield the CPU periodically, and a host of similar tactics.
I'm guessing all the code will get run together once I click submit, but here is how I create the diaglog box (it was working fine without the "WinAppRegisterModelessDialog", but I saw a reference to it elsewhere and tried it to see if it would help, not sure if it actually serves any useful purpose):
statWin = sADMDialog->Create(inPluginRef, DIALOG_ID, IDB_DIALOG1, kADMModalDialogStyle, NULL, NULL, 0);
WinAppRegisterModelessDialog((HWND)sADMDialog->GetWindowRef(statWin));
infoBox = sADMDialog->CreateItem(statWin, 5, kADMTextStaticType, &coords, NULL, NULL, 0);
// Status header
coords.top = coords.bottom + 10;
coords.bottom = coords.top + 12;
statHeader = sADMDialog->CreateItem(statWin, kADMUniqueItemID, kADMTextStaticType, &coords, NULL, NULL, 0);
// Status line
coords.top = coords.bottom + 10;
coords.bottom = coords.top + 12;
statLine = sADMDialog->CreateItem(statWin, kADMUniqueItemID, kADMTextStaticType, &coords, NULL, NULL, 0);
// Progress bar
coords.top = coords.bottom + 10;
coords.bottom = coords.top + 15;
progress = sADMDialog->CreateItem(statWin, kADMUniqueItemID, kADMProgressBarType, &coords, NULL, NULL, 0);
sADMItem->SetMinIntValue(progress, 0);
sADMItem->SetMaxIntValue(progress, totalPages);
// Set window size, and other attributes
sADMDialog->Size(statWin, coords.right + BORDER, coords.bottom + BORDER);
sADMDialog->SetText(statWin, PROD_NAME " - Progress");
// Set header for status line
sADMItem->SetText(statHeader, " Page # % Complete Estimated Time remaining");
// Initialize progress bar
sADMItem->Update(progress);
Updates are currently performed with the following code segment. The last two lines are my attempts to get the display to update once the screen blanks:
// show it
sADMItem->SetText(statLine, textBuf);
// Update progress bar
sADMItem->SetIntValue(progress, pagesCompleted);
// Force display update/refresh
sADMDialog->Update(statWin);
// Yield for display update (in case of screen blank or user changes)
Sleep((DWORD)100);
Everything works fine until the window is moved or screen blanking occurs, after that nothing seems to work, all updates to the box cease to be displayed. Any suggestions?

Answer 1

OK guys here's an update. First I went to BIOS and updated the initial display setting to "LCD panel only" from "Auto". At first I thought it helped, because when I worked at the laptop without the external screen attached, the internal LCD panel resumed normally from off (previously this didn't work).
But today while I was in the office with my external 19" LCD screen attached, and both of them went off after being idle for 10 minutes, the internal LCD panel didn't resume again. So I've tried the Fn + F5 key combination to switch between modes, and I switched from dualview back to single. The internal LCD panel blinked for a second and then turned off immediately, and from that moment on, I was without picture on both of them. SO I ended up hibernating and resuming again. :( An important note - as soon as the computer began hibernating, the LCD went on and I could see the whole progress of hibernation before it turned off.
Also another note - when I'm in dualview, I always have keep the internal LCD panel as the primary screen. So unfortunately, when it doesn't resume, I don't have access to the taskbar etc to try more things...
Any more thoughts?
Thanks again!
Rado