diff --git a/phpBB/docs/CHANGELOG.html b/phpBB/docs/CHANGELOG.html
index 878ae3d23f..6a456b3b94 100644
--- a/phpBB/docs/CHANGELOG.html
+++ b/phpBB/docs/CHANGELOG.html
@@ -93,6 +93,7 @@
 		<li>[Fix] Correctly determine writable status of files on Windows operating system. (Bug #39035)</li>
 		<li>[Fix] Show report button in prosilver for guests who are allowed to report posts. (Bug #45695 - Patch by bantu)</li>
 		<li>[Fix] Correctly show private message history (Bug #46065 - Patch by bantu)
+		<li>[Fix] Various XHTML mistakes in prosilver and subsilver2. (Bugs #38555, #45505 - Patch by Raimon, #45785, #45865)</li>
 		<li>[Change] Change the data format of the default file ACM to be more secure from tampering and have better performance.</li>
 		<li>[Feature] Backported 3.2 captcha plugins.</li>
 		<li>[Feature] Introduced new ACM plugins:
diff --git a/phpBB/styles/prosilver/template/memberlist_im.html b/phpBB/styles/prosilver/template/memberlist_im.html
index 9bb1f90a58..a99d487f4f 100644
--- a/phpBB/styles/prosilver/template/memberlist_im.html
+++ b/phpBB/styles/prosilver/template/memberlist_im.html
@@ -7,7 +7,7 @@
 
 <div class="panel bg2">
 	<div class="inner"><span class="corners-top"><span></span></span>
-	
+
 	<p>{L_SEND_IM_EXPLAIN}</p>
 
 	<fieldset>
@@ -81,9 +81,10 @@
 
 	<span class="corners-bottom"><span></span></span></div>
 </div>
-<a  href="#" onclick="window.close(); return false;">{L_CLOSE_WINDOW}</a>
 </form>
 
+<a href="#" onclick="window.close(); return false;">{L_CLOSE_WINDOW}</a>
+
 <script type="text/javascript">
 // <![CDATA[
 
diff --git a/phpBB/styles/prosilver/template/posting_preview.html b/phpBB/styles/prosilver/template/posting_preview.html
index 7ea1fb063d..82227c23b0 100644
--- a/phpBB/styles/prosilver/template/posting_preview.html
+++ b/phpBB/styles/prosilver/template/posting_preview.html
@@ -1,4 +1,4 @@
-<div class="post bg2" id="preview">
+<div class="post <!-- IF S_PRIVMSGS -->pm<!-- ELSE -->bg2<!-- ENDIF -->" id="preview">
 	<div class="inner"><span class="corners-top"><span></span></span>
 
 <!-- IF S_HAS_POLL_OPTIONS -->
@@ -19,16 +19,16 @@
 	<span class="corners-bottom"><span></span></span></div>
 </div>
 
-<div class="post <!-- IF S_PRIVMSGS --> pm<!-- ELSE --> bg2<!-- ENDIF -->">
+<div class="post bg2">
 	<div class="inner"><span class="corners-top"><span></span></span>
 
 <!-- ENDIF -->
 
 	<div class="postbody">
 		<h3>{L_PREVIEW}: {PREVIEW_SUBJECT}</h3>
-		
+
 		<div class="content">{PREVIEW_MESSAGE}</div>
-		
+
 		<!-- IF .attachment -->
 		<dl class="attachbox">
 			<dt>{L_ATTACHMENTS}</dt>
@@ -37,7 +37,7 @@
 			<!-- END attachment -->
 		</dl>
 		<!-- ENDIF -->
-		
+
 		<!-- IF PREVIEW_SIGNATURE --><div class="signature">{PREVIEW_SIGNATURE}</div><!-- ENDIF -->
 	</div>
 
diff --git a/phpBB/styles/subsilver2/template/memberlist_im.html b/phpBB/styles/subsilver2/template/memberlist_im.html
index acbe1fec2f..1acdaafd4b 100644
--- a/phpBB/styles/subsilver2/template/memberlist_im.html
+++ b/phpBB/styles/subsilver2/template/memberlist_im.html
@@ -131,9 +131,9 @@
 	<!-- ENDIF -->
 
 	</table>
-	<a class="nav" href="#" onclick="window.close(); return false;">{L_CLOSE_WINDOW}</a>
 {S_FORM_TOKEN}
 </form>
 
+<a class="nav" href="#" onclick="window.close(); return false;">{L_CLOSE_WINDOW}</a>
 
 <!-- INCLUDE simple_footer.html -->
\ No newline at end of file
diff --git a/phpBB/styles/subsilver2/template/search_results.html b/phpBB/styles/subsilver2/template/search_results.html
index d277b51db9..a6c30f97b2 100644
--- a/phpBB/styles/subsilver2/template/search_results.html
+++ b/phpBB/styles/subsilver2/template/search_results.html
@@ -8,7 +8,7 @@
 </tr>
 <tr>
 	<td class="genmed"><!-- IF SEARCH_TOPIC -->{L_SEARCHED_TOPIC}: <a href="{U_SEARCH_TOPIC}"><b>{SEARCH_TOPIC}</b></a><br /><!-- ENDIF --><!-- IF SEARCH_WORDS -->{L_SEARCHED_FOR}: <a href="{U_SEARCH_WORDS}"><b>{SEARCH_WORDS}</b></a><!-- ENDIF --><!-- IF IGNORED_WORDS --> {L_IGNORED_TERMS}: <b>{IGNORED_WORDS}</b><!-- ENDIF --></td>
-	<td align="{S_CONTENT_FLOW_END}"><!-- IF SEARCH_IN_RESULTS --><span class="genmed">{L_SEARCH_IN_RESULTS}: </span><input type="text" name="add_keywords" value="" /> <input class="btnlite" type="submit" name="submit" value="{L_GO}" /><!-- ENDIF --></td>
+	<td align="{S_CONTENT_FLOW_END}"><!-- IF SEARCH_IN_RESULTS --><span class="genmed">{L_SEARCH_IN_RESULTS}: </span><input class="post" type="text" name="add_keywords" value="" /> <input class="btnlite" type="submit" name="submit" value="{L_GO}" /><!-- ENDIF --></td>
 </tr>
 </table>
 
diff --git a/phpBB/styles/subsilver2/template/viewtopic_body.html b/phpBB/styles/subsilver2/template/viewtopic_body.html
index b177a15250..f243c37371 100644
--- a/phpBB/styles/subsilver2/template/viewtopic_body.html
+++ b/phpBB/styles/subsilver2/template/viewtopic_body.html
@@ -118,9 +118,9 @@
 		<!-- ENDIF -->
 			</table>
 			{S_HIDDEN_FIELDS}
-			
+
 			</form>
-			
+
 		</td>
 	</tr>
 <!-- ENDIF -->
@@ -155,7 +155,7 @@
 				</table>
 			</td>
 		</tr>
-		
+
 		<!-- IF postrow.S_ROW_COUNT is even --><tr class="row1"><!-- ELSE --><tr class="row2"><!-- ENDIF -->
 
 			<td valign="top" class="profile">
@@ -179,6 +179,11 @@
 				<tr>
 					<td>{postrow.POSTER_AVATAR}</td>
 				</tr>
+			<!-- ENDIF -->
+			<!-- IF not (postrow.ONLINE_IMG or postrow.RANK_TITLE or postrow.RANK_IMG or postrow.POSTER_AVATAR) -->
+				<tr>
+					<td></td>
+				</tr>
 			<!-- ENDIF -->
 				</table>