Microsoft’s Windows Phone platform has been hit by a bug in its digital signatures system.
The problem reportedly affects older handsets that have been recently updated to the Windows Phone 7.5 operating system.
The rollout of the new Windows Phone Dev Center, which replaced the previous App Hub, is said to be the cause of the bug.
According to Engadget, a “small percentage” of apps in the Windows Phone Store are not installing on the affected mobiles.
They include some fairly high profile titles, such as WhatsApp, The New York Times and Microsoft's own Bing-powered Translator.
The site reports that Microsoft is working on a solution, but in the meantime no new apps can be published on the Windows Phone Store until the digital certificate signing issue is sorted out.
It’s still possible to download existing apps – if they work – but users should be wary of resetting their phones until the bug fix is released.