CSS broken in Firefox 26 with Avast Internet Security

Bikeradar no loner displays any CSS using Firefox and come up with just the text
Has happened on two of my machines - think it may be linked to Avast Internet Security which I have installed on both machines at diferent times.
Only site I have found that is affected. Any chance site admin could have a look and if there is a temporary solution I'd appreciate it.
Thanks
Has happened on two of my machines - think it may be linked to Avast Internet Security which I have installed on both machines at diferent times.
Only site I have found that is affected. Any chance site admin could have a look and if there is a temporary solution I'd appreciate it.
Thanks
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Page looks very bare with ad blocked, but did load remainder of CSS