Hi Dmitry
It is a know issue that has been introduced in C1 4.1, and is fixed in the latest check in of C1 4.2 Beta.
https://compositec1.codeplex.com/SourceControl/changeset/31350#CompositeC1/Composite/Core/WebClient/Media/ImageResizer.cs
We do not recommend using latest changeset for a production use, you can either create a custom build of Composite.dll 4.1 with merged fix, or if your company purchased a support agreement - contact our support team.
It is a know issue that has been introduced in C1 4.1, and is fixed in the latest check in of C1 4.2 Beta.
https://compositec1.codeplex.com/SourceControl/changeset/31350#CompositeC1/Composite/Core/WebClient/Media/ImageResizer.cs
We do not recommend using latest changeset for a production use, you can either create a custom build of Composite.dll 4.1 with merged fix, or if your company purchased a support agreement - contact our support team.