Hi I have the following piece of code to upload a file to Sharepoint. It uses HTTP PUT:
public static string UploadFile(string destUrl, string sourcePath)
Alex, This happened to me too. You probable should create another another lit or document library and upload files into it to test.
You may want to check the variable "destUri" to see if it points to exactly the expected sharepoint list.
My situation is I firstly created a document library "Requrements", there is a typo mistake, then i changed the title to "Requirements". You should notice that sharepoint still keeps the URL to this list as http://server:port/Requrements
This is an exeption. Hopefully it helps.