In phpBB 3.1 RC5, when issuing a warning for a post, the MCP shows the post contents under "Post details" but the BBCode isn't parsed properly.

Easy fix: /includes/mcp/mcp_warn.php
Find: $parse_flags = OPTION_FLAG_SMILIES | ($row['bbcode_bitfield'] ? OPTION_FLAG_BBCODE : 0);
Replace with: $parse_flags = OPTION_FLAG_SMILIES | ($user_row['bbcode_bitfield'] ? OPTION_FLAG_BBCODE : 0);