Hi everybody.
I’m an Italian user of ColorThink Pro just from a couple of months.
As I had been having some problems (see below) especially when I was working on large color lists as those you can get extracting unique colors from images, I was about to post to the forum looking for help, when I managed to focuse that numbers in the list were in the “European” format” (“.” Period for grouping integers; “,” comma as decimal digits separator – just the opposite of the English notation…) according to the default settings of the Italian version of Windows XP running on my pc.
Therefore I remembered that more than once I had spent already several days stuggling with the apparently crazy behavior of some English-only program releases, where calculations played a major role, until I ended up to realize it was just a matter of number formats.
No need to say that changing the format to the English one led to an happy end…
This is a list of some troubles that I had encountered – or at least I was aware of, so it isn’t probably exhaustive - before the “discovery of the century”: 
- a baffling, general lack of stability .
- a series of problems that concerned the Delta-E values column sorting: ColorThink was able to complete the task only working on very short lists (I mean no more than a few hundred patches) while on the longer ones it would “froze”. BTW, the sorting on the short lists, even if apparently completed, was wrong – I guess the program was able to recognize only the integer part of the numbers, ignoring the decimal digits after the comma separator.
- The “collateral effects” seemed to extend to reliability of the Delta-E values display in “Image” section and of the gamut shifting representation by vectors in the Grapher as well……
I apologize to have “discovered the warm water”, as we say in Italy, if this issue had been highlited already (and I apologize for my not-exactly-oxfordian English too…) but the search in the forum I did before posting didn’t found any result about.
Hoping my post may be helpful, expecially for non-English users, best regards.
Stefano