Sometimes I get an error message about the command line. Why?
Since AllTray 0.7.1dev, the command line parser has been changed to be the standard parser found in glib. If you wish to pass options to a program (such as Evolution), you can do so by running AllTray as follows:
$ alltray -- evolution --component=mail
Note the standalone "--", which tells AllTray that it should not parse any more of the command line but instead pass it verbatim to the program that is being run under AllTray.
Please see the man page for this and other changes; the man page for AllTray is distributed with AllTray in the source code distribution.