A couple of things have changed in 2.28. The addon will try to migrate your layout as good as possible but in some areas you might need to do some polishing.

General

If your settings are not saved or HUDUF does not show up,... remove the huduf folder in interface/addons. Get a clean copy from curse.com. Reinstall the addon and check if this persists. If that does not help create a backup of your users folder. Remove the folder user\interface\AllCharacters\HUDUnitFrames. See if the error occurs with the default settings. Open a ticket and attach a copy of your backed up saved variables files and a exact description of what is wrong (screenshots are very welcome).

Labels

The anchoring labels has changed

If your label is not in the spot that it should be checked the anchors. If any of the drop down menus is empty you had an invalid setting in it. Chose the correct anchor and hit apply.

The label does not show

• If your label is hidden check the visibility setting of the label. If show is unchecked check it and press apply
• If your label is hidden check the height of the label. Try increasing it and press apply.
• Check the format string, if it is empty then the migration code could not handle it. Enter the correct tag in the text box and press apply. For a list of tags see the change log.

Icons

The anchoring labels has changed

If your icon is not in the spot that it should be checked the anchors. If any of the drop down menus is empty you had an invalid setting in it. Chose the correct anchor and hit apply.

My Icon has moved

Apply an offset using x offset and y offset.

My Icon has changed in size

Correct the scale using the scale option

What is this green thing

That is the party leader indicator, try lowering its scale. You should see a crown.

Bars

I stacked bars on top of each other to have additional texture layers, they doesnt show up the way I want them to

Use the bar border and bar decal texture settings to handle this. More options i.e. load order and layer will follow in 2.29

My bar has some kind of fog over it

Check if you have enabled the decal texture, this texture is foremost. Uncheck show.

I dont see my bar its all white (or any other colour)

Check if you have enabled the decal texture, this texture is foremost. Uncheck show.

SC/WB

Whenever I click a unit in the warband or scenario frame I target myself

Open the config gui and change the click behavior of SCTemplate and WBTemplate from player to group.

Config GUI

Option xyz is not longer there

Check all sub menus, if you cant find it open a ticket or post in the HUDUF thread on WHA.

Where is the state menu gone?

General

Where is the bar grow option?

Bar Fill

Where is the Highlight with target option?

Highlight (as in Highlight with target)