Although 1.5.0.25 claims to fix this ("Fixed being unable to apply black/grey/white/none swatch if already highlighted"), this problem persists in 1.5.0.26. In the Swatches panel, both the bar of recent colours and the bar of fixed colours (none, black, grey, white) do not adjust the highlighted swatch to match the selection, and usually (thought not always any more) clicking on a selected swatch will not change the colour of the selected object.
Hope this can be really fixed before release.
To replicate: Create an object, colour it black. Create another object, colour it white (using either the recent colours bar or the fixed colours bar within the Swatches panel). Select the first object and attempt to click the same white swatch to make this black object white. (No effect.)
Edit: Oddly, if you do the exact same steps but reverse the colours so that the first object is white and the second object is black, you are able to make the first object black using the same swatch. So, something has changed from before when this consistently didn't work, but the bug is not fully resolved.