After a large import or some slower PCs,  the final merge results page does not always appear.  The Merge DID complete, but OAK!Merge could not display the results.   OAK!Merge appears to be stuck.  This was tracked to defect in the progress bar being displayed and was fixed in the 14.

OAKMerge may appear to be stuck on the Merging step

3 beta release.  It will be out in the 14.4 release.