While a crash of Ultra Recall would result in the last (unsaved) changes from being lost, it should never result in the complete loss of the data in the .urd file.
Ultra Recall uses the highly reliable, fully atomic sqlite database engine which provides very high performance and efficiency while ensuring that all changes to .urd files are transactional (all or nothing)... The .urd-journal files are used in this transaction processing - but unfortunately cannot be used to recover information from.
Is the .urd file simply gone, empty, or corrupt? The only explanation I can think of is that something on your computer actually deleted or corrupted the .urd file (like a failing hard-drive or other process or application)...
If the .urd file is present but seems to be corrupted, you can send it to
support@kinook.com for our analysis and potential recovery (which is probably not likely).