Some logging statements will not work as intended after upgrading to 1.7.25, due to a change in the way exceptions are handled in MessageFormatter. The following test will illustrate the issue:
 

@Test
public void testExceptionAsParameter() {
  Exception e = new Exception("A terrible mistake");
  result = MessageFormatter.format("Error! {}", e).getMessage();
  assertEquals("Error! A terrible mistake", result);
}

Result:

org.junit.ComparisonFailure: 
 Expected :Error! A terrible mistake
 Actual :Error! {}

This seems to be a regression of SLF4J-353.