My problem fixed too! it is not more than a week that i have been engaged with Reporting Service and from the first day I found so many issues and bugs and errors.. I do not underestand why we developers are so crazy about microsoft tools! ?? just wasting the time on the 'Microsoft' problems.... may be it is the only choice!
The issue is not Microsoft tools problem but rather Reporting Services which is an add on to SQL Server which comes with a designer with many issues. There are many that I call known issues but yes some are bugs that needs to be fixed. And it is free so you will get more from it if you write clean T-SQL code.
I am also not aware of other Reporting tools providing subscription, I think SSRS provide it because Microsoft owns the relational engine used to execute the reports. The Agent is what I call the automation subsystem when your problems are related to the Agent it is not SSRS issue, yes SQL Server but not SSRS.