@traptest it might be worth trying to clear out old versions of the library first, perhaps. It also depends if you’re using Python 2.x or 3.x since “pip install” will only update the library for 2.x.
If you’ve got a revision 0x13, Model B+ then this fix will certainly be the one you’re looking for. Try running the following to see what revision you’re running:
cat /proc/cpuinfo | grep Revision
You can try reinstalling the library for Python 2 and 3 like so:
sudo pip uninstall rpi_ws281x
sudo pip3 uninstall rpi_ws281x
sudo pip install rpi_ws281x
sudo pip3 install rpi_ws281x