GeertC,   Sorry for the delay, I was looking into the issue for you and realized that the reason is that OM Essentials can no longer pull warranty info. It goes to a warranty API that no longer works.
It seems that OME 2.5 is no longer updating the warranty information.OS : Widows 2012 R2eventviewer error An exception occurred while executing the update entitlements command.System.InvalidOperationException: This operation cannot be performed after the request has been submitted.at System.Net.HttpWebRequest.set_Proxy(IWebProxy value)at A.c79c8de9bdea1ffd6f966bffbc9a5ba03.ca764db811c74db9ef938ce4855ef62e4(IWebProxy c6b779604249e71ed7152f97dfb0a4fc5, Collection`1 c50d08ca7b51998b4ddcae6d12447b98e, Guid c17e388d839db60d3e7eb853b6e2db027)at A.c518f605bcb1006bfaf660bc9535384d4.c629f56ece384058e9647eb4bbcddcf55(List`1 c50d08ca7b51998b4ddcae6d12447b98e)
OME 2.5 - retrieving Warranty information - System.InvalidOperationException