Hi Hal,
>>...What browser are you using?..
IE version is 8.0.6001.18702 ( Up-to-date with Windows Update ) on Windows XP. I will also verify how 'Mark all topics read' works with IE version 9.x on Windows 7 Professional.
Here is a list of some IDZ Forums to verify:
software.intel.com/en-us/forums/intel-c-compiler
software.intel.com/en-us/forums/intel-parallel-studio
software.intel.com/en-us/forums/intel-integrated-performance-primitives
software.intel.com/en-us/forums/intel-math-kernel-library
software.intel.com/en-us/forums/intel-avx-and-cpu-instructions
software.intel.com/en-us/forums/intel-visual-fortran-compiler-for-windows
software.intel.com/en-us/forums/intel-vtune-amplifier-xe-and-vtune-performance-analyzer
software.intel.com/en-us/forums/intel-inspector-xe
software.intel.com/en-us/forums/intel-advisor-xe
software.intel.com/en-us/forums/intel-media-sdk
software.intel.com/en-us/forums/intel-perceptual-computing-sdk
software.intel.com/en-us/forums/threading-on-intel-parallel-architectures
software.intel.com/en-us/forums/mobile-software-development
software.intel.com/en-us/forums/software-tuning-performance-optimization-platform-monitoring
software.intel.com/en-us/forums/power-efficiency
software.intel.com/en-us/forums/watercooler-catchall
Take into account that on some IDZ Forums 'Mark all topics read' works (!) and on some it doesn't (!).
