Lightroom Classic 8: Mojave 10.14 - image export hangs indefinitely and requires force start

Can you please confirm:

1. Where the original images are stored?
2. Where you're exporting to?
3. Your export settings, for example, file format.
4. The number of images in each export (e.g. does it happen with just 1?)

1.  Images stored on local Samsung 950 Pro SSD attached to Thunderbolt port.  Have tried additional source (local SATA drive attached to USB3)  which is also part of the LR Library with no change in behavior. Tired, DMG and Tiff image types with no change as well.  (iMac Pro)
2.  Process hangs before that (any) dialog box appears.
3.  Same as #2
4.  Just one image and tried Export, Export as Previous, and even Export to Email (HD) with same result.    

Problem may be related to disk access in general as I also just had it hang on me while trying to find a missing folder on the primary NVMe disk as well.   Have been using on High Sierra without any related issues. 

Problem resolved.   Don't know exactly what was causing it yet, but it was definitely OS related and required two reboots.   

Thanks for the update Natasha!