The cleanup in
SAK-21124, r105036 eliminated the default value for content.upload.max, which has been at 20 MB for quite some time. This results in two odd behaviors. The first is a limit of 1 MB and the second is that this number is omitted from the display.
The related code is a bit kludgy, where there are two separate coded defaults: 1 and 20. There are also two confusingly named properties, content.upload.max and content.upload.ceiling.
My suggestion is to change the code default to 20 in ResourcesHelperAction.java:1725, remove the "Default: 1" line in default.sakai.properties, and uncomment the actual setting.