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ACM module is used in multiple JoomlArt templates and this update is not specific for JA Mood (which i presume you are using).
I see the issues as following :
1. Joomla update system to update JoomlArt products for now requires Joomlart credentials. We will need to find a way to allow jomsocial users to use the same. Give it some time for us to figure it out.
2. When and if ACM module is updated also for JA Mood, the template version will change too. Until then please ignore such updates.
3. If you look at the download files included in the JA Mood download folder, there are multiple modules / plugins too. It is safe to assume that until the JA Mood template version is changed, all other dependent extensions version are safe to ignore as they may have been updated only for other templates.
4. We will still get it checked and on monday I will reply back here.
5. To avoid such misunderstanding again, all dependent modules / plugins of JA Mood even if updated for other templates will be checked for JA Mood also and always kept upto date.