Hi Stu,
there was an OpenSSL update with the 8.55 build, so you'll need to deploy the SSL DLL's, but I think you've done that.
On the server, where it's broken, right click on each of the 3 SSL DLL's (ie not the MS one), go to the details tab, and check the "version" there. It should be
1.0.2d
for all 3 of them.
>> All four files are there, and they are the same ones that were there previously today before I installed this latest build.
3 of them were updated with the latest build, so they shouldn't be the same as before.
Cheers
Bruce