Thanks Musab - your suggestion lead me to a change that I made a few months ago.

I added this in msdb..sp_help_category stored proc to not show all our ReportServer subscriptions in SQL Server Agent - as there is a lot.

--Start Of SSRS Subscriptions

SET @where_clause += N'

AND

CASE

WHEN

name = ''Report Server''

AND (

SELECT program_name

FROM sys.sysprocesses

where spid = @@spid) = ''Microsoft SQL Server Management Studio'' THEN 0

ELSE 1

END = 1 '

--End Of SSRS Subscriptions

-- Execute the query EXECUTE (@cmd + @where_clause + N'ORDER BY category_type, name')

I comment it and I was able to access the Alerts again.

Is there maybe an alternative to not show the SSRS subscriptions in SQL Server Agent? What i am doing now is just to comment that part to create a few alerts and then uncomment it again to not show all the subscriptions.