diff --git a/src/render.cpp b/src/render.cpp
index 000279e..a896666 100644
--- a/src/render.cpp
+++ b/src/render.cpp
@@ -60,14 +60,15 @@ u32 mem_edit_bg_color_fn(const u8 *, u64 off, void *user_data)
   }
 
   if (rdata.rng_anchor_key.start <= off && off < rdata.rng_anchor_key.end()) return COL(app->vsettings.col_key);
-  if (rdata.rng_header.start - rblob_sz <= off && off <= rdata.rng_header.start) return COL(app->vsettings.col_key);
-  if (rdata.rng_footer.start - rblob_sz <= off && off <= rdata.rng_footer.start) return COL(app->vsettings.col_key);
+  if (rdata.rng_header.start - rblob_sz <= off && off < rdata.rng_header.start) return COL(app->vsettings.col_key);
+  if (rdata.rng_footer.start - rblob_sz <= off && off < rdata.rng_footer.start) return COL(app->vsettings.col_key);
   if (rdata.rng_anchor.start <= off && off < rdata.rng_anchor.end()) return COL(app->vsettings.col_anchor);
   if (rdata.rng_header.start <= off && off < rdata.rng_header.end()) return COL(app->vsettings.col_header);
   if (rdata.rng_footer.start <= off && off < rdata.rng_footer.end()) return COL(app->vsettings.col_footer);
 
   // Slow page group lookup, ideally only done once per render when last_pinfo is invalid.
   for (Page_Info_Chunk *chunk = rdata.page_chunks; chunk; chunk = chunk->next) {
+    if (chunk->range.start - rblob_sz <= off && off < chunk->range.start) return COL(app->vsettings.col_key);
     if (chunk->range.start <= off && off < chunk->range.end()) {
       for (u64 group_idx = chunk->first_group; group_idx < rdata.n_page_groups; ++group_idx) {
         const Page_Info_Group &group = rdata.page_groups[group_idx];
diff --git a/src/root/RMicroFileReader.cxx b/src/root/RMicroFileReader.cxx
index 2f89068..9e92431 100644
--- a/src/root/RMicroFileReader.cxx
+++ b/src/root/RMicroFileReader.cxx
@@ -1177,7 +1177,12 @@ RMicroFileReader::GetNTupleProper(const char *ntupleName)
    fileInfo.anchor_key_nbytes = key.fKeyLen;
    fileInfo.anchor_seek = offset;
    fileInfo.anchor_nbytes = objNbytes;
-   fileInfo.rblob_key_header_nbytes = RTFKey{}.GetHeaderSize() + 3;
+   {
+      // @Incomplete: each section has a differently-sized RBlob, we need to account for that!
+      RTFKey dummy;
+      dummy.MakeBigKey();
+      fileInfo.rblob_key_header_nbytes = dummy.GetHeaderSize();
+   }
    fileInfo.tfile_header_nbytes = RTFHeader{}.GetSize();
    // @----
    ReadBuffer(ntuple, objNbytes, offset);