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I also had that same bug, <empty> KB/MB indication and it also only occurred after version 2.04 and as stated before, I also have a personalized formatting for numbers (English (US) customized). Decimal symbol = comma (,) and the Digit grouping symbol is a point (.)
With this setting, the total size is empty, changing it to Decimal symbol = point (.) and Digit grouping symbol = comma (,), the size is displayed.
This setting is mine for many years, so it seems to be some change in the way CCleaner handles this information from version 2.04 onwards.
When I set the format to standard, CCleaner displays the information, whenever it's my customized formatting, the information is missing.
Thank you anyway for indicating this as the reason, as I uninstalled and reinstalled CCleaner to get rid of the problem, unfortunately without success.
By the way, my OS is Microsoft Windows XP Professional (english) -- Locale United States -- Version 5.1.2600 Service Pack 2 Build 2600
Regional and Language Options - Regional Options [tab] - Standards and formats: English (United States) - Number 123.456.789,00
Regional and Language Options - Languages [tab] - Text Services and Input Languages --> Default input language -- French - Swiss French
IE-Version 7.0.5730.11 --
Firefox : Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
My current CCleaner-version is v2.06.567
