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Last week's Patch Tuesday contained the MS08-014 patch for Microsoft Office Excel 2003. The "critical" fix amended a potential remote execution flaw, but seemingly created a different set of problems.

"The original version released on 11 March 2008 did fully protect against the security issues discussed in the bulletin," claims Microsoft's Tim Rains on the company's Security Response Center blog.

"However, after release we discovered that the security update caused a calculation error in Microsoft Excel 2003 when a Real Time Data source was used in a user-created Visual Basic for Applications solution (in other words a custom-built VBA function)."

Rains advises Excel 2003 users to refer to this Knowledge Base article to deploy the update.