By view point of parallelism, sometimes we access .png files by multiple threads simultaneously. Current pngcs implementation prevents things from working properly because OpenFileForReading method in FileHelper performs Read/Write (calling FileStream(String, FileMode) constructor without passing third argument; FileAccess, result in R/W access) and perform locks on files.

So, I propose applying the following patch on FileHelper.cs

• isx = new FileStream(file, FileMode.Open);
• isx = new FileStream(file, FileMode.Open, FileAccess.Read);

Just forgot to note. Please refer to http://msdn.microsoft.com/en-us/library/47ek66wy(v=vs.110).aspx for more detail about FileStream constructor behaviour.

Had the exact same problem with the component and fixed the code thanks to your comment. I my case the file was placed on a network drive and FileAccess.Read was the only way to open the file for reading.