Can you get your site in dev mode so we can see what the error is? A generic 500 isn't much to go on..

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Thanks Uncle Cheese - now in dev mode..
no error message being shown, but as soon as I add ?flush=1 to the url, the same link works perfectly..

Back when I was having this problem, I think I corrected it by doing this:

1. Get SS Core 2.4.5 from website
2. Get the latest (possibly unstable) Event Management Module from GitHub (ajshort-silverstripe-eventmanagement-b4a9964)

In short, trying to pull the latest SS Core + Module from the website will fail.

I am nervous of using unstable code on a live site, currently using ver 927b40b.
The weird thing is that the url works if you add flush=1, or remove the date portion of the url...

UncleCheese - Is this module only compatible with MySQL as a backend? I'm using SilverStripe 2.4.4 on Windows with MSSQL2008 and are able to install/build the module fine along with creating calendar/calendar events however in trying to preview the calendar I receive the following error:

"[User Error] Couldn't run query (42000, 102, [Microsoft][SQL Server Native Client 10.0][SQL Server]Incorrect syntax near '`'.

"

Within Calendar.php I'm seeing various instances of code that, if run inside of a SQL query tool, also throws an error associated with the '`' character (backsticks).
e.g.
"
return DataObject::get(
$this->getEventDateTimeClass(),
$where,
"StartDate ASC, StartTime ASC, `CalendarDateTime`.EventID ASC",
$this->getEventJoin()
"

This is the same issue as reported here:
http://www.silverstripe.org/all-other-modules/show/16979

I have tried replacing all instances of ` with ' but still receive other errors so I may have to be more selective.
Can you confirm this is an issue with a SQL2008 backend?

TIA