I recently started a new world and fortress specifically for testing game mechanics. I want to learn to min max work order management as I am planning a mega project map and I feel that understand this will help things go smoothly.
So far, I have found the three following issues. I am not sure these are user error, by design, graphical/user interface, or feature/functionality issues.

Issue 1: Unable to designate specific wood type for beds
When making a work order for beds, I am attempting to specifying the type of wood. The menu opens, and I make my selection. Once Selected the work order doesn't update to indicate that is is now a <wood type> bed, like it would for example a "wooden apple bin". In my limited testing bed are not of the material type I selected, even though they were selected.

-Workaround: I believe I can work around this issue taking from a wood stockpile that designates the specific wood. (I will likely use this workaround later to setup for magma specific materials so multiple workshops can pull form a singe magma safe stockpile without multiple specific work orders).

Issue 2: Unable to remove designation for material selection.
In testing the above, when creating a wooden bin work order, I found that you can't remove the designation of a material. You can change it, but you can't go back to using whatever is available. Once I was done testing, I then found that I was unable to remove the designation like you can when assigning a bedroom, or other similar selection menu.

Issue 3: Removing active work orders created in the work orders screen from the workshops active list can cause work orders to stop working. I am not sure if this is an issue with the work order, the workshop or the manager. But every time I have canceled an order created by the manager, the work orders stop being activated. The manager will create other work orders, but not those that I manually canceled. I stopped doing this, and haven't tested since the latest patch...

-Workaround: The only way I was to address this was for me to delete and re-create the work order and workshop.

Additional Question: Is there a simple to view list of the current know bugs and issues, or an alternative to the Mantis bug tracker? I have had no luck searching mantis.