Google changing case of URLs in SERPs?

[Natitude]

Noticed some strange behavior over the last week or so regarding our SERPs and I haven't been able to find anything on the web about what might be happening.

Over the past two weeks, I've been seeing our URLs slowly change from upper case to lower case in the SERPs. Our URLs are usually /Blue-Fuzzy-Widgets.htm but Google has slowly been switching them to /blue-fuzzy-widgets.htm. There has been no change in our actual rankings nor has it happened to anyone else in the space. We're quite dumbfounded as to why Google would choose to serve the lower case URL.

To be clear, we do not build links to these lower case URLs, only the upper. Any ideas what might be happening here?

[gigmasters]

related to this, has there been any research done to see which urls convert better (lower case, upper case, camel case), etc?

[Andy.Drinkwater]

I wouldn't worry if all it is is a change in how it looks - but a screenshot would be good for all to see.

Regards,

Andy

[Natitude]

As of yet, no change in rankings. It's also been gradual with one or two URLs switching here and there. We still have upper case URLs ranking for certain terms and I've even seen a few that have switched back and forth from day to day.

[rishil]

two questions: do the lowercase URLs work? (i.e have you set up rules to allow them on your system?)

Could you ping me an example? This is a policy of google Adwords, however I have yetto com across one in SERPs...

[Andy.Drinkwater]

There have been reports of Google playing around with different things recently including how listings appear, such as Ad Words, and Sitelinks.

I wouldn't worry too much about them changing to lowercase as this might be to do with one of these changes - have you noticed rankings change or is it just the way they look?