Can't open more than one instance of app on CEF 120.1.8

[thefunkyjoint]

Recently i upgraded to CE4Delphi 120.1.8.

Now i can't open more than one instance of my app anymore, the second instance will crash.

I tested with Simplebrowser demo , this is how to reproduce :

1 - Open Delphi, load SimpleBrowser demo. Compile and run it, it will run ok.

2 - Now, copy simplebrowser.exe to simplebrowser2.exe and run simplebrowser2.exe outside Delphi, it will run ok.

3 - Now repeat step 1 : on the line 'GlobalCEFApp.StartMainProcess', an AV is generated and the app crashes :

"Project SimpleBrowser.exe raised exception class $C0000005 with message 'access violation at 0x00000000: access of address 0x00000000'."

This problem did not happen on previous CEF / DCEF versions.

Any ideas about how to fix it ?

[thefunkyjoint]

PS : Looks like it's a CEF4Delphi issue, not CEF related...

I tested with the CEF sample program (cefclient.exe) and the crash won't happen.

[salvadordf]

CEF has changed the initialization and now it checks if other application uses the same GlobalCEFApp.RootCache value.

Read these threads for more information :
https://www.briskbard.com/forum/viewtopic.php?f=10&t=2208
https://magpcss.org/ceforum/viewtopic.php?f=6&t=19665

[thefunkyjoint]

This is bad news... i'll try some workaround, maybe creating different directories for each instance.

I know the ideal is to have a tabbed browser, but there are people that like to open several instances of the app, don't ask me why

[salvadordf]

You can use a named mutex to detect a second instance.
Then send a message to the first instance to open a new tab.