I wanted to set up tracking on one of my adwords ad's today, so changed the destination url from:

www . mysite . co.uk

to

www . mysite .co.uk / index.php?t=1

This displayed absolutely fine when you moused over the link. However, when I clicked on the link (both in the adwords interface, and on search results) it went do

www . mysite .co.uk index.php/?t=1

Which then came up with a 404 error, as the forward slash was in the wrong place.

In the end I fixed it by using instead:

www . mysite .co.uk /?t=1

And that worked fine. Never had the problem before though, and can't undertand why it was doing it?