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You need to close all the browsers before closing your app following the "destruction sequence" described in the code comments.
Some demos have a slightly different sequence. Please read the comments from the demo that you used as a template for your application.
For example, the MiniBrowser demo do this before closing the form :
1. FormCloseQuery sets CanClose to FALSE calls TChromium.CloseBrowser which triggers the TChromium.OnClose event.
2. TChromium.OnClose sends a CEFBROWSER_DESTROY message to destroy CEFWindowParent1 in the main thread, which triggers the TChromium.OnBeforeClose event.
3. TChromium.OnBeforeClose sets FCanClose := True and sends WM_CLOSE to the form.
If there are some threads or processes remaining then it means that there's some destruction sequence step missing.
Use the SimpleBrowser2 demo as a base for your application and add your drag and drop functions to that demo.
The SimpleBrowser demo works fine but SimpleBrowser2 follows the CEF3 recommendations to the letter.
SimpleBrowser2 has the destruction sequence that I copied in my previous post.
