diff --git a/documentation/release_6.1.htm b/documentation/release_6.1.htm
index 69cc7a310..0531a4677 100644
--- a/documentation/release_6.1.htm
+++ b/documentation/release_6.1.htm
@@ -84,8 +84,10 @@ <H2>What's new for developers (aside from what should be obvious
 
 <h3>Backward incompatibities</h3>
 <ul>
-<li>
-</li>
+    <li>
+        Additional checks on <code>GeometryBlocksOnCylindrical</code> scanner configuration, which may lead to an
+        error being raised, while previously the code silently proceeded.
+    </li>
 </ul>
 
 <h3>New functionality</h3>
diff --git a/src/buildblock/Scanner.cxx b/src/buildblock/Scanner.cxx
index 27bfb495d..b66dee692 100644
--- a/src/buildblock/Scanner.cxx
+++ b/src/buildblock/Scanner.cxx
@@ -1754,20 +1754,19 @@ Scanner::check_consistency() const
     { //! Check consistency of axial and transaxial spacing for block geometry
       if (get_num_axial_buckets() != 1)
         {
-          warning(boost::format("BlocksOnCylindrical num_axial_buckets (%d) is greater than 1. This is not supported yet."
+          warning(boost::format("BlocksOnCylindrical num_axial_buckets (%d) is greater than 1. This is not supported yet. "
                                 "Consider multiplying the number of axial_blocks_per_bucket by %d.")
                   % get_num_axial_buckets() % get_num_axial_buckets());
           return Succeeded::no;
         }
-      { // Ensure the number of axial crystals per bucket is a multiple of the number of rings
-        // This asserts the number of axial
+      { // Assert that each block contains an equal number of axial crystals
         if (get_num_rings() % get_num_axial_crystals_per_bucket() != 0)
           {
-            error(boost::format("Error in GeometryBlocksOnCylindrical: number of rings (%d) is not a multiple of the "
-                                "get_num_axial_crystals_per_bucket "
-                                "(%d) = num_axial_crystals_per_block (%d) * num_axial_blocks_per_bucket (%d)")
-                  % get_num_rings() % get_num_axial_crystals_per_bucket() % get_num_axial_crystals_per_block()
-                  % get_num_axial_blocks_per_bucket());
+            warning(boost::format("Error in GeometryBlocksOnCylindrical: number of rings (%d) is not a multiple of the "
+                                  "get_num_axial_crystals_per_bucket "
+                                  "(%d) = num_axial_crystals_per_block (%d) * num_axial_blocks_per_bucket (%d)")
+                    % get_num_rings() % get_num_axial_crystals_per_bucket() % get_num_axial_crystals_per_block()
+                    % get_num_axial_blocks_per_bucket());
           }
       }
       if (get_axial_crystal_spacing() * get_num_axial_crystals_per_block() > get_axial_block_spacing())
diff --git a/src/include/stir/GeometryBlocksOnCylindrical.h b/src/include/stir/GeometryBlocksOnCylindrical.h
index f00636b6a..84677de4f 100644
--- a/src/include/stir/GeometryBlocksOnCylindrical.h
+++ b/src/include/stir/GeometryBlocksOnCylindrical.h
@@ -1,7 +1,6 @@
 
 /*
 Copyright 2017 ETH Zurich, Institute of Particle Physics and Astrophysics
- Copyright (C) 2024, Prescient Imaging
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -23,7 +22,6 @@ limitations under the License.
   \brief Declaration of class stir::GeometryBlocksOnCylindrical
 
   \author Parisa Khateri
-  \author Robert Twyman
 
 */
 #ifndef __stir_GeometryBlocksOnCylindrical_H__
diff --git a/src/recon_test/test_blocks_on_cylindrical_projectors.cxx b/src/recon_test/test_blocks_on_cylindrical_projectors.cxx
index c68144069..773a37d97 100644
--- a/src/recon_test/test_blocks_on_cylindrical_projectors.cxx
+++ b/src/recon_test/test_blocks_on_cylindrical_projectors.cxx
@@ -886,7 +886,7 @@ BlocksTests::run_back_projection_test_with_axial_buckets(BackProjectorByBin& bac
     scanner_sptr->set_transaxial_block_spacing(scanner_sptr->get_transaxial_crystal_spacing()
                                                * scanner_sptr->get_num_transaxial_crystals_per_block());
     scanner_sptr->set_num_axial_blocks_per_bucket(2);
-    scanner_sptr->set_num_rings(scanner_sptr->get_num_axial_blocks_per_bucket() * num_buckets);
+    scanner_sptr->set_num_rings(scanner_sptr->get_num_axial_crystals_per_bucket() * num_buckets);
     scanner_sptr->set_scanner_geometry("BlocksOnCylindrical");
     scanner_sptr->set_up();
   }