Ok, meanwhile I have been able to analyze the current state-of-Play between the new Sandboxie / Sandboxie-Plus variants. And I have to say, I'm somewhat torn apart between Scylla and Charybdis here. Back to "classical" Sandboxie-installer "SandboxieInstall64-v5.44.0.exe" I've found out that the recently introduced nuisance/failure in Opera (started with vers.-71-somewhat) still persists. Each time when starting the browser sandboxed the following error-message will pop-up: https://www.dropbox.com/s/jlp4w59nn8vlo9c/Sbie-error-6.jpg?dl=0 , reading SBIE2303 Could not hook CM_Add_Driver_PackageW (33, 1655) SBIE2318 DLL initialization failed for 'cfgmgr32.dll' Needless to say, this error message does not occur for Opera if run outside of the sandbox. Interestingly enough that same error-message WILL also NOT OCCUR with the full SB-Plus "Sandboxie-Plus-x64-v0_4_4.exe "-package, the first actual difference in runtime-conduct encountered by me so far. However, "upgrading" to the full Plus-variant comes with significant disadvantages, too. The new tray-icon can no longer perform direct operations like immediately terminating all processes within the sandbox, for instance in case of a virus/malware-emergency, via a right mouse-click. And much worse - while the new UI shows some enhancements - it is also crippled in essential parts. Most annoying of all: The "Quick-recovery-" and even worse the "Immediate-recovery-" functionality is gone - or hopefully just not yet implemented. A key-feature of Sandboxie has always been that after one or more downloads to some specified folders or of specified file-types (-extensions) a pop-up would immediately open and ask the user if to extract those downloaded files from the Sandbox right away. Because if that offer is not submitted right in place you will sooner or later forget about those downloads, close the browser together with the sandbox shutting down automatically - and suddenly all these downloaded files will be gone! Btw, does anybody have a suspicion what that "cfgmgr32.dll"-error-message might mean for the browser-functionality or what new Opera-"feature" might be the root of the problem? Any educated guess would be highly appreciated.