Were you able to resolve this? I am facing the same issue with no resolution in sight.
Its TOAD 13.3 64bit on WIndows 10 Professional.
Worked fine for months and just stopped working.
I have tried reinstalling with cleaning the AppData/Roaming directories.
Running it as Administrator
Running it in Compatibility mode.
Granted full permissions to Everyone on all of the quest folders, also made sure that none was read-only.
All I get is the below
18:46:56:598 Toad.dpr Line 1
18:46:56:598 User Profile checking command line parameters
18:46:56:598 User Profile checking settings location INI
18:46:56:602 AppData Location: C:\Users\xxx\AppData\Roaming\Quest Software\Toad for Oracle\13.3
18:46:56:603 User Profile refreshing client files
18:46:59:223 Parsing command line parameters
18:46:59:223 Creating Toad mutex
18:46:59:223 Loading Toad settings from Toad.ini
18:46:59:240 Initializing application
18:46:59:532 Creating GlobalDataModule
18:46:59:614 Performing Toad's startup tasks
18:46:59:614 Setting FPU exception mask
18:46:59:614 Setting Application properties
18:46:59:614 Desensitizing drag & drop
18:46:59:614 Creating GUISettings folder
18:46:59:614 Setting Toad help file
18:46:59:624 Checking for critical files
18:46:59:630 Getting license information
18:46:59:630 Verifying Toad license
18:46:59:633 Checking existing QuestKey licenses
18:46:59:823 Found permanent license
18:46:59:823 Saving edition to SettingsLocations.INI file
18:46:59:827 License status: Perpetual
18:46:59:827 Checking entitlement period
18:46:59:827 Setting global options
18:46:59:832 Checking installer induced policy restrictions
18:46:59:833 Checking installer induced enablements
18:46:59:833 Checking runtime intelligence opt-in
18:46:59:833 Opted out of runtime intelligence reporting
18:46:59:833 Has internet access
18:46:59:833 Starting settings auto-save thread