Redmine

When updating an issue:
If you choose a value for type of time spent and/or type a comment for that time in the Log Time section of the Issue update screen, but do not enter a time, your comment and time type is silently dropped and lost. This could lead to people thinking that their time entry has gone through when it should be complaining about the missing value.

This does not happen on the 'pure' Log Time screen for an issue, which rightly complains when something is missing.

This happens on my installations as per below, but is also easily demonstrable on the latest Demo Redmine instance.

About your application's environment
Ruby version              1.8.7 (i386-mingw32)
RubyGems version          1.3.7
Rack version              1.0
Rails version             2.3.5
Active Record version     2.3.5
Active Resource version   2.3.5
Action Mailer version     2.3.5
Active Support version    2.3.5
Application root          c:/redmine
Environment               production
Database adapter          mysql
Database schema version   20100819172912

About your Redmine plugins
Redmine Graphs plugin   0.1.0
Redmine Charts          0.1.0