Xbox 360 Modern Warfare 3 online matchmaking won't work properly in countries not supported by Xbox Live.
PC and PS3 versions appear to have no such problem.
Croatia is not an official Xbox Live region.
Infinity Ward creative strategist Robert Bowling offered a similar explanation, although hinted there may be more to it.
He told Twitter user Victor Bilan that, "With matchmaking you must look at more variables than just game code, especially when only impacting only certain regions."
"Regretfully no ETA at this point," he added, on the topic of a fix. "It's something actively being discussed and investigated. Talking to users being affected."
However, such a fix wasn't on the list of MW3 issues being addressed and/or discussed at Infinity Ward that Robert Bowling shared last night.
Blogger John385 claimed the Modern Warfare 3 matchmaking system was weighted to prioritise local players when searching. He then alleged that problems weren't restricted to unsupported Xbox Live regions; he said he'd heard similar reports from Malaysia, Norway, Portugal, Creece, Cyprus and Finland.
The Call of Duty: Modern Warfare 3 forum has a long thread of people sharing their online matchmaking problems. The thread, incidentally, was started by Robert Bowling.
But Eurogamer Norway told us it was yet to have any such problem come to its attention.
John385 has supplied a video of the specific problem he, in Croatia, experienced.
Eurogamer has asked Activision for clarification, but has yet to hear back.
Until we do, we'd like to ask you if you've experienced any of the same problems or have any helpful information you'd like to share. You can either post below or contact us directly.