I experienced this issue a month ago or so where the "Merge" button on the SmartResearch screen is no longer accessable. Last time I saw this thread in the forum and installed ver 1189 version of FTB. This seemed to get rid of the problem.
Two nights ago-- it happened again. This time I found a newer version on the myheritage site-- rev 1198.
I installed this version but there was no remedy of the dimmed merge button.
Also the SmartMatching seems to be somewhat flakey-- on the FTB PC side it shows a match with multiple hits, and then when I select the match it says there are no matches available. This happens on many of the matches denoted but not all.
When this started happening again-- I had just crossed the 5000 person in my tree. I noticed that there was some message posts about a limit of 5000 matches due to a security limit. This seems a little odd that you would limit users to an arbitrary number when we have to pay extra to get the feature in the Premium package. A much more smart limit would be to have a date range on the limit so that a user can not match a large number within say a week or something similar.
Any assistance you can provide would be greatly appreciated-- sinice this issue has severly limited my use of the system.
The most updated version of the software is version 1198 which you can download from above link.
The version includes the merge limit update and few other minor bug fixes.
You get the message that you have the latest version because version 1198 includes only small fixes that do not effect all users. There is no need to send all users a message to download and install again as the merge limit effects only small percentage of our users.
Anyway, version 1198 has a limit of 50,000 merges. This limit is very high and I am sure will not intrefer with your work.