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**New Testing Info**
This may be of interest to Mr. Kovid Goyal or other software programmers here:
I experimented after a full (not Portable) install.
1) Run calibre.exe as admin.
2a) Program pops a wizard window to set location for a Calibre Library folder. Folder must be empty.
2b) Main Calibre user interface window pops up normally.
3a) Exit program.
3b) Run calibre.exe as admin.
4) Splash screen image displays text >>starting Calibre >> initializing user interface >> program window border outline appears, then program hangs >> use Windows Task Manager to End Process and shut down Calibre.
5) Two files are created in the new Calibre Library folder: metadata.db and metadata_db_prefs_backup.json.
6) I rename (or could delete) the metadata.db file to hide from program.
7a) Run calibre.exe as admin.
7b) Main Calibre user interface window pops up normally. A new metadata.db file is created in the Library folder - this new file will remain unmodified by me.
8) Viewing Task Manager, the calibre.exe process maintains a 45-50% cpu load which seems very high as I haven't initiated any program functions. Besides the process load, nothing abnormal seems to be happening.
8) Exit program.
9) Repeat Run & Exit routine again w/o issues except the process load which seems high.
10) Try to Add an epub to the library. Program hangs and must use Task Manager to End Process.
11) Launch ebook-viewer.exe. Opens OK.
12) Try to open epub. Popup Error window details > Worker appears to have hung.
13a) If ebook-viewer is shut down, and attempt to open is repeated, the same error message appears.
13b) If ebook-viewer is kept open after the error, subsequent attempts to open the same or other books are successful w/o error messages. After shutting ebook-viewer down and re-starting, there is always an error on the first attempt to open a book, then subsequent attempts are successful.
14) Done - for now.
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