I made a widget to be used as a HUD, it contains one [Button] 100x100 (CFont) and added a [Text Block] (AText) next to it with the content text as displayed.
After doing a bit of digging I have found that this is a known issue (UE-9181) and that it has been sent to the developers for further review. I will provide updates with any pertinent information as it becomes available. I will also be sure to bump the community interest for this issue. Thank you for your time and information.
I went ahead and double checked on this issue for you. It appears that this issue has not been updated to fixed as of yet. There is not a current time frame in place as to when a solution will be available. Have you tried using a scale box to dynamically change the size of your widgets?