Outlook sends messages on startup but outbox is empty because of stuck read receipt confirmations, Messages stuck in outbox

 I run into two issue with Outlook 16:

1. Outlook says sending x of y messages on startup, but outbox is empty
2. Messages are stuck in outbox

How-I-fixed-it:

I found out, that the lock was caused by read confirmations stuck in the send queue, which did not occur in the outbox.

First of all, I disabled the read confimation sending in the Outlook options (E-Mail -> Read Receipts)

The solution then was to abort the submit of the stucked read confirmations using the Tool MFCMAPI as described here:

Delete a stuck Read Receipt - HowTo-Outlook

Unreal Editor project loading stuck at 39%

Loading a project in Unreal Editor Version: 4.25.1-13594126+++UE4+Release-4.25 on my computer stuck at 39% when RayTracing is enabled for a project. The Shader Compile Working runs forever on 100% CPU. I have a GTX 1050 Ti GPU and GeForce drivers 446.14 installed.

How-I-fixed-it:
Setting the r.SkinCache.CompileShaders=False in the DefaultEngine.ini (project location\config) made the editor start again.

Discussion in the unreal forum:

https://forums.unrealengine.com/community/general-discussion/1710131-unable-to-start-unreal-stuck-at-39