Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Blue Coat Systems (Nasdaq: BCSI) are taking a shellacking again, having fallen by as much as 12% in intraday trading three months after losing 8% on the heels of reporting unimpressive third-quarter earnings.

So what: Lower guidance and executive departures were the culprits this time. Management reduced its expectations for Q4 revenue to a range of $120.5 million to $121.5 million, down from $121 to $128 million. Non-GAAP profit is due to come in between $0.30 and $0.31 a share, down from $0.32 to $0.38 a share. Brian NeSmith, who had been CEO before assuming the role of products chief, and David de Simone, senior VP of products and technology, will leave the company at the end of next month.

Now what: Blue Coat positioned the departures and lower outlook as the result of a sort of strategic review that resulted in the creation of three distinct product groups: Web Security, WAN Optimization, and Cloud Services. Maybe this is what Blue Coat needs, but seeing key rivals in core markets post outstanding earnings -- Riverbed Technology (Nasdaq: RVBD) in WAN Optimization and F5 Networks (Nasdaq: FFIV) in Web Security, for example -- tells me my investing dollars are better placed elsewhere.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.